This Halloween, treat yourself to the most durable, beautiful string lights around. OptiCore polycarbonate bulbs are shatterproof and thicker than ordinary bulbs, giving these lights a rich glow. The commercial-grade stringer is tough enough to withstand any kind of weather. And they're energy efficient at only 40 watts per set. Perfect in trees and bushes, along fences, on patios and decks, and more. These are lights you will enjoy for years to come.